Klaviyo + Smile.io Integration: The Complete Setup Guide for Shopify

Loyalty StrategyBy ShuvoMay 24, 202613 min read

Most Shopify stores running Smile.io and Klaviyo treat them as two separate apps. Points get awarded over here, emails get sent over there, and the customer never feels the connection. That's the integration leaving the most money on the table in DTC right now.

This guide is the exact Klaviyo + Smile.io integration playbook I run for clients — what it syncs, how to connect it in under 15 minutes, the five flows you should build on top of it, and the segmentation recipes that turn passive points balances into repeat revenue.

I'm Shuvo. I run AURORA — a Klaviyo Partner and Smile.io Partner agency. We've installed and integrated Smile + Klaviyo for 100+ Shopify brands across skincare, supplements, food & beverage, and lifestyle.

• Klaviyo Partner
• Smile.io Partner
• Shopify Partner
• Built for Shopify
• 5.0★ Verified Clients

Why integrate Klaviyo and Smile.io

Smile.io is the best Shopify loyalty app for most growing DTC brands — points, VIP tiers, and referrals in one platform, with a free tier up to 200 orders/month. Klaviyo is the default ESP for Shopify brands above $50K/month. The two were built to work together, and the integration is genuinely well-designed.

But here's the math that matters: a loyalty program without lifecycle email is a database. A lifecycle program without loyalty data is generic. Wire them together and you can trigger emails the moment a customer earns 500 points, hits a VIP tier, or has a reward expiring in 7 days — the highest-intent moments in the entire post-purchase journey.

How Smile.io works

Before the integration makes sense, here's the 60-second version of how Smile.io works on Shopify:

• Points — customers earn points for purchases, account creation, birthdays, social follows, and reviews. Default is 1 point per $1 spent.
• Rewards — customers redeem points for discount codes (e.g. 100 points = $5 off). Smile generates a unique code per redemption.
• VIP tiers (Smile Memberships) — Bronze/Silver/Gold based on lifetime spend or points earned, each with multiplier perks.
• Referrals — every customer gets a unique Give-$X-Get-$X link. Both sides earn when the referred friend makes a qualifying purchase.

Smile holds all of this data. Klaviyo, by default, knows none of it. That's the gap the integration closes.

What the Klaviyo Smile.io integration actually syncs

Once connected, Smile pushes data into Klaviyo in two ways: as profile properties on every customer, and as metrics (events) you can trigger flows from.

Profile properties added to every Klaviyo profile:

• Smile Points Balance — current redeemable points (live)
• Smile VIP Tier — Bronze / Silver / Gold (or your custom tier names)
• Smile VIP Tier ID — useful for segmentation logic
• Smile Referral URL — the customer's unique referral link
• Smile Member Since — the date the customer joined the program

Metrics (events) you can trigger Klaviyo flows from:

• Earned Points in Smile — fires every time a customer earns points
• Redeemed Reward in Smile — fires on redemption
• Reached VIP Tier in Smile — fires on tier promotion (Silver, Gold)
• Completed Referral in Smile — fires when a referral converts
• Points Expiring in Smile — fires X days before expiry (configurable)

Prerequisites

• Shopify store on any plan (Basic, Shopify, Advanced, or Plus)
• Active Smile.io account — the Klaviyo integration requires the Growth plan or higher (the free tier doesn't include it)
• Active Klaviyo account with the Shopify integration already connected
• A Klaviyo Private API key with full access scopes

If you haven't installed Smile.io yet, start with our step-by-step Shopify install guide first.

New to Smile.io entirely? Read the Smile.io Shopify setup guide first →

Need the business case for Smile before you commit? Read our Smile.io for Shopify review →

Klaviyo Smile setup: step by step

The integration itself takes about 15 minutes. The flows on top take a day. Here's the exact sequence:

• Step 1. In Klaviyo, go to Account → Settings → API Keys. Create a new Private API Key with full access. Copy it.
• Step 2. In Smile, go to Apps → Browse Integrations → Klaviyo. Click "Connect."
• Step 3. Paste the Klaviyo Private API Key when prompted. Smile validates the key and pulls your Klaviyo lists.
• Step 4. Choose the Klaviyo list Smile should sync members to (we use the main newsletter list, not a separate "Smile Members" list — keeps everything in one place).
• Step 5. Toggle ON every event sync: Earned Points, Redeemed Reward, Reached VIP Tier, Completed Referral, Points Expiring.
• Step 6. Save. Smile begins backfilling profile properties immediately for existing Klaviyo members and continues syncing live.
• Step 7. Verify in Klaviyo. Open any test customer profile and confirm you see Smile Points Balance, Smile VIP Tier, and Smile Referral URL under their custom properties. If they're missing, the API key scope is wrong — recreate it with full access.

5 must-build Klaviyo flows powered by Smile data

Wiring the integration is table stakes. These five flows are where the revenue actually comes from.

1. Smile Welcome Series

Trigger: Earned Points in Smile (first time). 3 emails over 7 days teaching the customer how to earn, how to redeem, and what VIP perks unlock at the next tier. Most stores skip this and wonder why redemption rates are 12%.

2. Points Balance Nudge

Trigger: customer has 100+ points and hasn't redeemed in 30 days. "You have $X in rewards waiting." Single highest-converting loyalty email by a wide margin — customers who redeem once redeem repeatedly.

3. Reward Expiring

Trigger: Points Expiring in Smile (30 days out). Two-email sequence at 30 and 7 days. Loss-aversion language outperforms reward language: "Don't lose your 750 points."

4. VIP Welcome

Trigger: Reached VIP Tier in Smile. Personalized welcome with the tier-specific perks list and a one-time unlock bonus (free shipping, gift with purchase, early access to a drop). Hits at peak customer affinity.

5. Referral Thank-You + Reminder

Trigger A: Completed Referral in Smile → instant thank-you email with their new balance and a nudge to refer again. Trigger B: 14 days after first purchase with zero referrals sent → reminder with their unique link prominent and dead simple to share.

Need the architecture for every essential Klaviyo flow, not just the Smile-powered ones? Read the 7 Klaviyo Flows Every Shopify Store Needs →

Segmentation recipes

With Smile properties syncing into Klaviyo, you unlock segments that were impossible before. The four we build for every client:

• VIP at Risk — VIP Tier is Gold or Silver AND no purchase in 45 days. Highest LTV cohort going dormant — worth a personal-feeling winback.
• High Points, No Purchase — Points Balance > 500 AND no purchase in 60 days. They have unredeemed value sitting there. One email usually converts.
• Referral Advocates — Completed Referral in Smile in last 90 days. Your real evangelists — send first access, gift-with-purchase, or a thank-you bonus.
• Points-Active, Engagement-Cold — Points Balance > 0 AND not opened email in 30 days. Use as a suppression segment so you stop emailing people the same way they've stopped reading.

Loyalty program setup for Shopify (the strategy half)

The integration only works as well as the program underneath it. If you're configuring loyalty program setup for Shopify from scratch or fixing a stale one, these are the numbers we ship with for most DTC brands:

• Earn rate — 1 point per $1 spent. Anything more generous gets expensive fast; anything less feels stingy.
• Account creation bonus — 200 points (~$10 value) to incentivize sign-up before first purchase.
• Birthday bonus — 250 points, 7-day window starting 3 days before. Requires you to actually collect birthdays (Klaviyo flow + Smile property capture).
• Redemption tiers — 100 / 500 / 1,000 / 2,000 points = $5 / $25 / $50 / $100 off. Effective discount = 5%.
• VIP thresholds — Silver at $250 lifetime spend, Gold at $1,000. Multipliers: 1.5x and 2x earning.
• Referral — Give $10, Get $10 with a minimum order ~50% of AOV to prevent gaming.
• Points expiry — 12 months of inactivity (not 12 months from earning). Triggers the reward-expiring flow above.

Common mistakes I see in Klaviyo + Smile integrations

• Connecting the integration but never turning on the event syncs. The Klaviyo profile properties update, but no flows can trigger. Every step in the setup above matters.
• Building a separate "Smile Members" list instead of syncing into the main list. Now you're maintaining two lists and your engagement segments are wrong.
• Triggering the welcome series on "Joined Smile Program" instead of "Earned Points first time." The first event is silent for most customers; the second is the moment they actually engage.
• Generic "You earned 50 points!" emails on every points event. Suppress the small ones. Only email at meaningful balances (100+ points, $5+ value).
• Not building the reward-expiring flow. Customers earning points and never being reminded is the #1 cause of low redemption rates.
• Forgetting to add Smile referral URL to the post-purchase email. The single best place to ask for a referral is right after the customer felt the win of a first delivery.
• Letting Smile send its default emails AND Klaviyo send loyalty emails. Pick one channel per event — we run everything through Klaviyo for deliverability and design control.
• Treating loyalty revenue as separate from email revenue in reporting. It's not. Wire UTM tags into Smile rewards so Klaviyo attribution catches the assist.

Measuring impact

Benchmarks we hit for clients within 90 days of a clean Klaviyo + Smile.io integration + the 5 flows above:

• Points redemption rate — 25–40% (industry average is 12–15%)
• VIP-tier revenue share — 30–50% of total store revenue from top two tiers
• Repeat purchase rate — +8–15 percentage points within 6 months
• Loyalty-attributed Klaviyo flow revenue — 6–12% of total Klaviyo revenue
• Referral conversion rate — 4–8% of customers send at least one referral

Track these in Klaviyo's Flows dashboard (filter by Smile-triggered flows) and Smile's Activity report. Reconcile them monthly.

Done-for-you option

If you'd rather skip the configuration and go straight to revenue, we build the entire stack — Smile install, program strategy, Klaviyo integration, all 5 flows, segmentation, and a 30-day performance review — in 14–21 days.

See exactly what we build, what it costs, and the timeline. Loyalty Program Setup service →

Prefer a fixed-price productized version? Smile Loyalty Setup — $1,997 →

Want to make sure your existing Klaviyo program is actually ready to handle the loyalty layer? Get a free 30-minute Klaviyo audit →